Designation A645/A645M − 10 (Reapproved 2016) Standard Specification for Pressure Vessel Plates, 5 % and 51⁄2 % Nickel Alloy Steels, Specially Heat Treated1 This standard is issued under the fixed des[.]
Designation: A645/A645M − 10 (Reapproved 2016) Standard Specification for Pressure Vessel Plates, % and 51⁄2 % Nickel Alloy Steels, Specially Heat Treated1 This standard is issued under the fixed designation A645/A645M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision A number in parentheses indicates the year of last reapproval A superscript epsilon (´) indicates an editorial change since the last revision or reapproval A577/A577M Specification for Ultrasonic Angle-Beam Examination of Steel Plates A578/A578M Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications Scope 1.1 This specification covers specially heat treated % and 1⁄2 % nickel alloy steel plates intended primarily for welded pressure vessels for service at low or cryogenic temperatures 1.2 The maximum thickness of plates which can be supplied under this specification is limited only by the capacity of the material to meet the specified requirements General Requirements and Ordering Information 3.1 Plates supplied to this material specification shall conform to Specification A20/A20M These requirements outline the testing and retesting methods and procedures, permitted variations in dimensions and mass, quality and repair of defects, marking, loading, and ordering information 1.3 This material is susceptible to magnetization Use of magnets in handling after heat treatment should be avoided if residual magnetism would be detrimental to subsequent fabrication or service 1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard Within the text, the SI units are shown in brackets The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other Combining values from the two systems may result in nonconformance with the specification 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use 3.2 In addition to the basic requirements of this specification, certain supplementary requirements are available when additional control, testing, or examination is required to meet end use requirements The purchaser is referred to the listed supplementary requirements in this specification and to the detailed requirements in Specification A20/A20M 3.3 If the requirements of this specification are in conflict with the requirements of Specification A20/A20M, the requirements of this specification shall prevail Materials and Manufacture 4.1 Steelmaking Practice—The steel shall be killed and shall conform to the fine austenitic grain size requirements of Specification A20/A20M Referenced Documents 2.1 ASTM Standards:3 A20/A20M Specification for General Requirements for Steel Plates for Pressure Vessels A435/A435M Specification for Straight-Beam Ultrasonic Examination of Steel Plates Heat Treatment 5.1 Grade A plates shall be heat treated in accordance with 5.2 Grade B plates shall be heat treated in accordance with 5.3 Shell plates and other parts, including heads and reinforcing pads that are heated above 1125°F [605°C] for forming, shall be heat treated after forming, This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.11 on Steel Plates for Boilers and Pressure Vessels Current edition approved March 1, 2016 Published March 2016 Originally approved in 1971 Last previous edition approved in 2010 as A645/A645M – 10 DOI: 10.1520/A0645_A0645M-10R16 For ASME Boiler and Pressure Vessel Code applications see related Specification SA-645 in Section II of that Code For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org For Annual Book of ASTM Standards volume information, refer to the standard’s Document Summary page on the ASTM website 5.2 Grade A, Procedure and Sequence: 5.2.1 Hardening—The plates shall be heated to a temperature within the range from 1575 to 1675°F [855 to 915°C], held within that temperature range for a minimum of h/in [2.4 min/mm] of thickness, but in no case less than 15 min, and then water-quenched to below 300°F [150°C] 5.2.2 Intermediate Heat Treatment—The plates shall be reheated to a temperature within the range from 1275 to Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959 United States A645/A645M − 10 (2016) TABLE Chemical Requirements 1400°F [690 to 760°C], held within that temperature range for a minimum of h/in [2.4 min/mm] of thickness, but in no case less than 15 min, and then water-quenched to below 300°F [150°C] 5.2.3 Tempering—The plates shall be reheated to a temperature within the range from 1150 to 1225°F [620 to 665°C], held within that temperature range for a minimum of h/in [2.4 min/mm] of thickness, but in no case less than 15 min, and then water-quenched or air cooled to below 300°F [150°C] Composition, % Element Grade A Carbon, max Heat Analysis Produce Analysis Manganese Heat Analysis Product Analysis Phosphorus, max Heat Analysis Product Analysis Sulfur, max Heat Analysis Product Analysis Silicon Heat Analysis Product Analysis Nickel Heat Analysis Product Analysis Chromium Heat Analysis Product Analysis Molybdenum Heat Analysis Product Analysis Aluminum, total Heat Analysis Product Analysis Nitrogen, max Heat Analysis Product Analysis 5.3 Grade B, Procedure and Sequence: 5.3.1 Hardening—The plates shall be heated to a temperature within the range from 1470 to 1600°F [800 to 870°C], held within that temperature range for a sufficient time to obtain uniform temperature throughout the plate thickness, and then quenched in a liquid medium 5.3.2 Intermediate Heat Treatment—The plates shall be reheated to a temperature within the range from 1200 to 1330°F [650 to 720°C], held within that temperature range for a minimum of h/in [2.4 min/mm] of thickness, but in no case less than 15 min, and then water-quenched to below 300°F [150°C] for nominal plate thicknesses over 5⁄8 in [16 mm], or cooled in air or water-quenched to below 300°F [150°C] for nominal plate thicknesses of 5⁄8 in [16 mm] and under 5.3.3 Tempering—The plates shall be reheated to a temperature within the range from 1020 to 1150°F [550 to 620°C], held within that temperature range for a minimum of 30 min/in [1.2 min/mm] of thickness, but in no case less than 15 min, and then water-quenched to below 300°F [150°C] Grade B 0.13 0.15 0.13 0.15 0.30–0.60 0.25–0.66 0.90–1.50 0.84–1.59 0.025 0.025 0.020 0.025 0.025 0.025 0.010 0.015 0.20–0.40 0.18–0.45 0.15–0.30A 0.13–0.33A 4.8–5.2 4.7–5.3 5.0–6.0 4.9–6.1 0.10–1.00 0.06–1.05 0.20–0.35 0.17–0.38 0.10–0.30 0.09–0.33 0.02–0.12 0.01–0.16 0.02–0.05 0.015–0.06 0.020 0.025 0.010 0.010 A The specified minimum limit does not apply if the total aluminum is 0.030 % or more, ore if the acid soluble aluminum content is 0.025 % or more Chemical Requirements TABLE Tensile Requirements 6.1 The steel shall conform to the chemical requirements given in Table unless otherwise modified in accordance with Supplementary Requirement S17, Vacuum Carbon-Deoxidized Steel, in Specification A20/A20M Yield strength, min, ksi [MPa]A Tensile strength, ksi [MPa] Elongation in in [50 mm], min, %B Mechanical Requirements Grade A Grade B 65 [450] 95–115 [655 to 795] 20.0 85 [590] 100–120 [690–830] 20 A At 0.2 % offset, or, if agreed between the purchaser and the manufacturer, at 0.5 % extension under load B See Specification A20/A20M for elongation adjustment 7.1 Tension Tests—The plates as represented by the tension test specimens shall conform to the requirements given in Table 7.1.1 For nominal plate thicknesses of 3⁄4 in [20 mm] and under, the 11⁄2 in [40 mm] wide rectangular specimen may be used for the tension test, and the elongation may be determined in a in [50 mm] gage length that includes the fracture and that shows the greatest elongation 7.2.3.1 Grade A: –220°F [–140°C] 7.2.3.2 Grade B: –320°F [–195°C] 7.2.4 Each specimen shall have a lateral expansion opposite the notch of not less than 0.015 in [0.38 mm] 7.2.5 The values of energy absorption in foot-pounds-force [joules] and the fracture appearance in percent shear shall be recorded and reported for information 7.2 Impact Tests: 7.2.1 Charpy V-notch tests shall be made in accordance with the general requirements of Specification A20/A20M 7.2.2 The longitudinal axis of the test specimens shall be transverse to the final direction of rolling of the plate 7.2.3 Unless otherwise agreed, the plates shall be impact tested at the following temperatures: Keywords 8.1 alloy steel; alloy steel plate; pressure containing parts; pressure vessel steels; steel plates; steel plates for pressure vessel applications A645/A645M − 10 (2016) SUPPLEMENTARY REQUIREMENTS A list of standardized supplementary requirements for use at the option of the purchaser is included in Specification A20/A20M Supplementary requirements shall not apply unless specified in the order Those which are considered suitable for use with this specification are listed below by title Others enumerated in Specification A20/A20M may be used with this specification subject to agreement by the supplier S11 Ultrasonic Examination in accordance with Specification A577/A577M, S12 Ultrasonic Examination in accordance with Specification A578/A578M, and S17 Vacuum Carbon-Deoxidized Steel S1 Vacuum Treatment, S2 Product Analysis, S6 Drop-Weight Test (for Material 0.625 in [16 mm] and over in Thickness), S8 Ultrasonic Examination in accordance with Specification A435/A435M, ADDITIONAL SUPPLEMENTARY REQUIREMENTS Also listed below are additional supplementary requirements which are considered suitable for use with this specification TABLE S1.1 Charpy Impact Requirements for Longitudinal Specimens S64 Longitudinal Charpy Impact Energy Absorption Requirement S64.1 When required, the purchaser may specify longitudinal Charpy V-notch impact testing to energy-absorption acceptance criteria S64.2 Tests shall be conducted in accordance with the general requirements of Specification A20/A20M S64.3 The longitudinal Charpy V-notch impact properties shall not be less than those shown in Table S1.1 S64.4 The impact values obtained on subsize specimens shall not be less than the values listed in Table S1.1 Size of Specimen, mm 10 10 10 10 10 10 by by by by by by 10 7.5 6.67 5.0 3.33 2.50 Charpy V-notch Impact Value Required for Acceptance (Average of Three Specimens), ft·lbf [J] Minimum Charpy V-notch Impact Value Without Requiring Retest (One Specimen Only of a Set), ft·lbf [J] 25 [34] 19 [26] 17 [23] 13 [18] [11] [8] 20 [27] 16 [22] 13 [18] 10 [14] [10] [7] S65 Transverse Charpy Impact Energy Absorption Requirement S65.3 The transverse Charpy V-notch impact properties shall not be less than those shown in Table S2.1 S65.4 The impact values obtained on subsize specimens shall not be less than the values listed in Table S2.1 S65.1 When required, the purchaser may specify transverse Charpy V-notch impact testing to energy-absorption acceptance criteria S65.2 Tests shall be conducted in accordance with the general requirements of Specification A20/A20M TABLE S2.1 Charpy Impact Requirements for Transverse Specimens Size of Specimen, mm 10 10 10 10 10 10 by by by by by by Charpy V-notch Impact Value Required for Acceptance (Average of Three Specimens), ft·lbf [J] Minimum Charpy V-notch Impact Value Without Requiring Retest (One Specimen Only of a Set), ft·lbf [J] 20 [27] 15 [20] 13 [18] 10 [14] [10] [7] 16 [22] 12 [16] 10 [14] [11] [7] [5] 10 7.5 6.6 5.0 3.33 2.50 A645/A645M − 10 (2016) ASTM International takes no position 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